U. Madubogwu, Ngozi, et al. “Evaluation of the Immunomodulatory Activity of Gnetum Africanum (Gnatacae) Leaf Extracts: doi.org 10.26538 Tjnpr V5i11.25”. Tropical Journal of Natural Product Research (TJNPR), vol. 5, no. 11, Nov. 2021, pp. 2043-50, https://tjnpr.org/index.php/home/article/view/359.